Paste the raw headers of a message to trace hops and read authentication results.
Header analyzer
Headers
Received: from …
Analyze
Parsing
Raw source
Private
Paste the raw headersCopy the original message source from your mail client.
Raw headers
Received: from mx1 by mx2
Received: from app by mx1
Authentication-Results:
spf=pass dkim=pass
dmarc=pass
Return-Path: <b@x.com>
DKIM-Signature: v=1; a=rsa
From: Acme <hi@acme.io>
Hop 1 · app.example[ms]
Hop 2 · mx1.migosmtp[ms]
Hop 3 · mx.gmail[ms]
SPF pass
DKIM pass
DMARC pass
Annotated
Fast
Parsed line by lineEach header is read and labelled.
Sender
Mailbox
Hop 1[ms]
Hop 2[ms]
Hop 3[ms]
Delivered to the mailbox
Hops
Delays
The path it tookFollow the message from sender to inbox.
Header hops
AI summary
Hop 1: sent 10:00:01
Hop 3: held 42 min
Hop 5: delivered
The delay was at hop 3
Receiver deferred the mail
It retried and arrived
AI
[n] minTotal time
3Slow hop
PassAuth
Finds the slow hop
Raw data kept
A one-line summary of the whole pathAI reads every hop and timestamp, finds where the delay or failure started and explains it simply. The raw hops stay visible below.
SPFAuthorised IP
PASS
DKIMSignature valid
PASS
DMARCAligned
PASS
Message passed authentication
Verdicts
Reasons
Authentication verdictsWhat SPF, DKIM and DMARC said.
Recommended actions
Fix any failing record
Reduce slow hops
Add a DKIM selector
Set DMARC reporting
Re-run the test
Actionable
Prioritised
What to do nextConcrete actions based on what we found.
Paste
Parse
Path
AI summary
Verdict
Next
Raw headers
Analysis
Hops[Parsed hop list]
SPF[pass / fail]
DKIM[pass / fail]
DMARC[pass / fail]
Sample output. [Connect to live lookups before launch]